Re: [j-nsp] MTU issue
Well, We had the same issue when switching one of our so called "wavelength" from L2 (1536) to MPLS/Jumbo (9216). After the usual Level 1 incompetence, we got tired and asked to bumped it to engineering, we found out they had some active booster that had a limitation of 2000 bytes per packet. There was an active/passive MUX, from FS.com, that created some headache for us too... - Alain Hebertaheb...@pubnix.net PubNIX Inc. 50 boul. St-Charles P.O. Box 26770 Beaconsfield, Quebec H9W 6G7 Tel: 514-990-5911 http://www.pubnix.netFax: 514-990-9443 On 10/22/18 16:21, john doe wrote: I talked to my supplier and they say that there is no MTU settings or limitations on their wavelength service. I have other wavelengths from the same supplier that works as expected so maybe it's not on their end. Johan On Mon, Oct 22, 2018 at 8:10 AM Mikael Abrahamsson wrote: On Mon, 22 Oct 2018, john doe wrote: The setup is a Cisco on one side and a MX one the other. Between them are a 10G wavelength. MPLS, RSVP is running and the ERO of my LSP is taking the What could cause the Low MTU? My guess is that it's actually not a "wavelength" but someones packet network in between and they're just calling it a "wavelength". So call the "wavelength" provider and ask them what MTU they support. -- Mikael Abrahamssonemail: swm...@swm.pp.se ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue
Check CoS config and the Mpc you are using. Is there fusion in the picture? > On 23 Oct 2018, at 07:55, Enoch Nyatoti via juniper-nsp > wrote: > > Hi, > Do you have a loopback filter with icmp rate limiting on the MX router? If so > try to deactivate and test. > > Best regards > E.N. > > > >On Monday, October 22, 2018, 10:21:57 PM GMT+2, john doe > wrote: > > I talked to my supplier and they say that there is no MTU settings or > limitations on their wavelength service. I have other wavelengths from the > same supplier that works as expected so maybe it's not on their end. > > Johan > >> On Mon, Oct 22, 2018 at 8:10 AM Mikael Abrahamsson wrote: >> >>> On Mon, 22 Oct 2018, john doe wrote: >>> >>> The setup is a Cisco on one side and a MX one the other. Between them >> are a >>> 10G wavelength. MPLS, RSVP is running and the ERO of my LSP is taking the >>> >>> What could cause the Low MTU? >> >> My guess is that it's actually not a "wavelength" but someones packet >> network in between and they're just calling it a "wavelength". So call the >> "wavelength" provider and ask them what MTU they support. >> >> -- >> Mikael Abrahamssonemail: swm...@swm.pp.se >> > ___ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > > ___ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue
Hi, Do you have a loopback filter with icmp rate limiting on the MX router? If so try to deactivate and test. Best regards E.N. On Monday, October 22, 2018, 10:21:57 PM GMT+2, john doe wrote: I talked to my supplier and they say that there is no MTU settings or limitations on their wavelength service. I have other wavelengths from the same supplier that works as expected so maybe it's not on their end. Johan On Mon, Oct 22, 2018 at 8:10 AM Mikael Abrahamsson wrote: > On Mon, 22 Oct 2018, john doe wrote: > > > The setup is a Cisco on one side and a MX one the other. Between them > are a > > 10G wavelength. MPLS, RSVP is running and the ERO of my LSP is taking the > > > > What could cause the Low MTU? > > My guess is that it's actually not a "wavelength" but someones packet > network in between and they're just calling it a "wavelength". So call the > "wavelength" provider and ask them what MTU they support. > > -- > Mikael Abrahamsson email: swm...@swm.pp.se > ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue
I talked to my supplier and they say that there is no MTU settings or limitations on their wavelength service. I have other wavelengths from the same supplier that works as expected so maybe it's not on their end. Johan On Mon, Oct 22, 2018 at 8:10 AM Mikael Abrahamsson wrote: > On Mon, 22 Oct 2018, john doe wrote: > > > The setup is a Cisco on one side and a MX one the other. Between them > are a > > 10G wavelength. MPLS, RSVP is running and the ERO of my LSP is taking the > > > > What could cause the Low MTU? > > My guess is that it's actually not a "wavelength" but someones packet > network in between and they're just calling it a "wavelength". So call the > "wavelength" provider and ask them what MTU they support. > > -- > Mikael Abrahamssonemail: swm...@swm.pp.se > ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue
On Mon, 22 Oct 2018, Aaron1 wrote: Not sure what your problem is but thought I would share that DWDM sometimes has an MTU limit It depends what it is. https://www.cisco.com/c/en/us/td/docs/routers/ncs4200/configuration/guide/chassis/ch-config-ncs4200-book/ch-config-ncs4200-book_chapter_01000.pdf page 4 "The standard 10 GbE LAN has a data rate of 10.3125 Gbps. In the OTU1e and OTU2e mapping schemes, the full 10.3125 Gbit/s is transported including the 64B/66B coded information, IPG, MAC FCS, preamble, start-of-frame delimiter (SFD) and the ordered sets (to convey fault information)." So with this kind of transport network, you should not have MTU limit because it's bit transparent. But then again, this is not "DWDM wave", this is a transport network of capacity. It can run at multiple speeds, and the whole talk about "waves" is typically a misnomer because it seldom is. -- Mikael Abrahamssonemail: swm...@swm.pp.se ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue
Last year I tried to set mtu to 16000 between (2) MX960’s that were connected with DWDM ciena... I was dropping packets and found out that the ciena DWDM had a mtu limit. I set my mx960’s to something around 9200 and was ok then Not sure what your problem is but thought I would share that DWDM sometimes has an MTU limit Aaron > On Oct 22, 2018, at 1:10 AM, Mikael Abrahamsson wrote: > >> On Mon, 22 Oct 2018, john doe wrote: >> >> The setup is a Cisco on one side and a MX one the other. Between them are a >> 10G wavelength. MPLS, RSVP is running and the ERO of my LSP is taking the >> >> What could cause the Low MTU? > > My guess is that it's actually not a "wavelength" but someones packet network > in between and they're just calling it a "wavelength". So call the > "wavelength" provider and ask them what MTU they support. > > -- > Mikael Abrahamssonemail: swm...@swm.pp.se > ___ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue
On Mon, 22 Oct 2018, john doe wrote: The setup is a Cisco on one side and a MX one the other. Between them are a 10G wavelength. MPLS, RSVP is running and the ERO of my LSP is taking the What could cause the Low MTU? My guess is that it's actually not a "wavelength" but someones packet network in between and they're just calling it a "wavelength". So call the "wavelength" provider and ask them what MTU they support. -- Mikael Abrahamssonemail: swm...@swm.pp.se ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
[j-nsp] MTU issue
Hi So I have some kind of MTU problem. The setup is a Cisco on one side and a MX one the other. Between them are a 10G wavelength. MPLS, RSVP is running and the ERO of my LSP is taking the direkt path between the boxes. All interfaces on both sides are well above 8000 in MTU, MPLS MTU on Cisco and Juniper side is also above 8000. Both boxes are PE routers. If I do a ping sweep from other routers connected to Cisco-router aswell as juniper-router to respective router both can show a sweep result that is above 8000, but not the path between them. If I make a ping sweep from the juniper to the Cisco on a LSP taking the direkct path I get this: 100! 5052. 2576. 1340! 2580. 1960. 1652. 1496! 1576. 1536. 1516! 1528! 1540. 1536. 1532! --- lsp ping sweep result--- Maximum Transmission Unit (MTU) is 1532 bytes What could cause the Low MTU? Johan ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue between juniper routers
Hi Pekka, I checked this , but there are no dropped packets by the loopback filter policers : show firewall filter protect-RE Filter: protect-RE Counters: NameBytes Packets bgp-traffic145288 2993 ftp-traffic 00 icmp-traffic 1800603780 62102280 junoscop-traffic 601 others 563402042 7809827 snmp-traffic63720 6015830 ssh-traffic 928 19 tcp-established3093764378 15322802 tcp-syn83165217062 telnet-traffic 17444 308 traceroute-traffic 98549 2359 vrrp-traffic00 Policers: Name Packets RE-HIGH-POLICER-ftp 0 RE-HIGH-POLICER-ssh 0 RE-HIGH-POLICER-vrrp0 RE-LOW-POLICER-tcp-syn-attack-protection0 RE-MEDIUM-HIGH-POLICER-ntp 0 RE-MEDIUM-HIGH-POLICER-snmp 1 RE-MEDIUM-LOW-POLICER-telnet0 RE-MEDIUM-LOW-POLICER-traceroute0 Thanks. > Date: Mon, 28 Mar 2011 08:38:18 +0300 > From: pek...@netcore.fi > To: merye...@hotmail.com > CC: juniper-nsp@puck.nether.net > Subject: Re: [j-nsp] MTU issue between juniper routers > > On Fri, 25 Mar 2011, meryem Z wrote: > > - MTU on Ge interface is configured to 4484 on both ends of the links. but > > ping (from P to PE ) greater than 1600 bytes fails. > > - I checked interfaces configuration , and also did a "show interfaces" to > > verify the effective mtu value used. everything is ok. > > - i'm suspecting some node on the transmission path between the P and the > > PE configured with the default value of 1500 for GE , but i couldn't find > > any equivalent command to the linux tracepath on juniper routers. > > This is not very probable but: > > Check that the packets are not being sent as fragments and dropped > in receiver's loopback filters. > > Even though MTU is high, we've come across unnecessary (IPv6) > fragmentation when certain conditions are met - PR/571596 > > -- > Pekka Savola "You each name yourselves king, yet the > Netcore Oykingdom bleeds." > Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue between juniper routers
On Fri, 25 Mar 2011, meryem Z wrote: - MTU on Ge interface is configured to 4484 on both ends of the links. but ping (from P to PE ) greater than 1600 bytes fails. - I checked interfaces configuration , and also did a "show interfaces" to verify the effective mtu value used. everything is ok. - i'm suspecting some node on the transmission path between the P and the PE configured with the default value of 1500 for GE , but i couldn't find any equivalent command to the linux tracepath on juniper routers. This is not very probable but: Check that the packets are not being sent as fragments and dropped in receiver's loopback filters. Even though MTU is high, we've come across unnecessary (IPv6) fragmentation when certain conditions are met - PR/571596 -- Pekka Savola "You each name yourselves king, yet the Netcore Oykingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue between juniper routers
Have you set the MTU on both logical and physical interfaces? On Mar 25, 2011, at 1:17 PM, Doug Hanks wrote: > Hmm. You can do it the good, old fashioned way with ping and the > do-not-fragment bit ;) > > -Original Message- > From: juniper-nsp-boun...@puck.nether.net > [mailto:juniper-nsp-boun...@puck.nether.net] On Behalf Of meryem Z > Sent: Friday, March 25, 2011 9:59 AM > To: juniper-nsp@puck.nether.net > Subject: [j-nsp] MTU issue between juniper routers > > > Hello Community, > > I have the following issue with MTU between some P-PE routers: > > - MTU on Ge interface is configured to 4484 on both ends of the links. but > ping (from P to PE ) greater than 1600 bytes fails. > - I checked interfaces configuration , and also did a "show interfaces" to > verify the effective mtu value used. everything is ok. > - i'm suspecting some node on the transmission path between the P and the PE > configured with the default value of 1500 for GE , but i couldn't find any > equivalent command to the linux tracepath on juniper routers. > > > Thanks and have a nice WE. > > > > ___ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > > ___ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp Will O'Brien University of Missouri, DoIT DNPS Network Systems Analyst - Redacted obri...@missouri.edu ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] MTU issue between juniper routers
Hmm. You can do it the good, old fashioned way with ping and the do-not-fragment bit ;) -Original Message- From: juniper-nsp-boun...@puck.nether.net [mailto:juniper-nsp-boun...@puck.nether.net] On Behalf Of meryem Z Sent: Friday, March 25, 2011 9:59 AM To: juniper-nsp@puck.nether.net Subject: [j-nsp] MTU issue between juniper routers Hello Community, I have the following issue with MTU between some P-PE routers: - MTU on Ge interface is configured to 4484 on both ends of the links. but ping (from P to PE ) greater than 1600 bytes fails. - I checked interfaces configuration , and also did a "show interfaces" to verify the effective mtu value used. everything is ok. - i'm suspecting some node on the transmission path between the P and the PE configured with the default value of 1500 for GE , but i couldn't find any equivalent command to the linux tracepath on juniper routers. Thanks and have a nice WE. ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
[j-nsp] MTU issue between juniper routers
Hello Community, I have the following issue with MTU between some P-PE routers: - MTU on Ge interface is configured to 4484 on both ends of the links. but ping (from P to PE ) greater than 1600 bytes fails. - I checked interfaces configuration , and also did a "show interfaces" to verify the effective mtu value used. everything is ok. - i'm suspecting some node on the transmission path between the P and the PE configured with the default value of 1500 for GE , but i couldn't find any equivalent command to the linux tracepath on juniper routers. Thanks and have a nice WE. ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
[j-nsp] MTU issue on Martini Tunnel
Hi,
I am trying to test a Martini Tunnel between an ERX1440 and M10i
router. Physical topology is as follows:
Host1 --e-- ADSL CPE1 ---a--- ATM Cloud ---a--- ERX(PE1) ---e---
M-series(P) ---e--- M10i(PE2) ---a--- ATM Cloud ---a--- ADSL CPE2
--e-- Host2
Legend:
--e-- : Ethernet connectivity
--a-- : ATM connectivity
ERX and M10i has IP connectivity via another M-series router in
between. I am trying to connect CPE1 and CPE2 via a Martini tunnel so
that they are connected via an end-to-end PVC and the two LANs (shown
as Host1 and Host2) are connected to each other on the same L2
broadcast domain. Layer 2 protocol is Ethernet (VLANs exist on core)
except around the ATM cloud where it is ATM. ADSL CPEs are in bridge
mode. I am using LDP for signaling. The L2 circuit comes up and the
two hosts are able to ping each other but only with a maximum IP
packet size of 1468. If I break the Martini and terminate the two PVCs
on the two PEs directly creating a sub-interface and assigning IPs, I
am able to ping between hosts with a maximum IP packet size of 1500
bytes. Why is the MTU reduced by 32 bytes when I connect the hosts via
a Martini tunnel.
I have set an interface MTU of 1684 and IP mtu of 1500 on core links;
between P and PEs.
Config on ERX and M10i are as follows:
interface atm 13/0.10101
atm pvc 10101 0 62 aal5all 0 0 0
mpls-relay 786
#show configuration interfaces at-0/2/1
mtu 9192;
clocking external;
encapsulation atm-pvc;
atm-options {
pic-type atm2;
promiscuous-mode {
vpi 1;
}
}
#show configuration interfaces at-0/2/1.786
encapsulation atm-ccc-vc-mux;
vci 1.101;
#show configuration protocols l2circuit
neighbor {
interface at-0/2/1.786 {
virtual-circuit-id 786;
}
}
Any help/pointers?
Regards,
Junaid
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